diff --git a/README.md b/README.md
index c415ae7..fde8ae7 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@
 ![GitHub go.mod Go version](https://img.shields.io/github/go-mod/go-version/emiago/sipgo)
 
 **SIPGO** is library for writing fast SIP services in GO language.  
-It comes with [SIP stack](/sip/README.md) ([RFC 3261](https://datatracker.ietf.org/doc/html/rfc3261)|[RFC3581](https://datatracker.ietf.org/doc/html/rfc3581)) optimized for fast parsing.
+It comes with [SIP stack](/sip/README.md) ([RFC 3261](https://datatracker.ietf.org/doc/html/rfc3261)|[RFC3581](https://datatracker.ietf.org/doc/html/rfc3581)|[RFC6026](https://datatracker.ietf.org/doc/html/rfc6026) optimized for fast parsing.
 
 ---
 **NOTE**: LIBRARY IS IN PROCESS GETTING TO 1.0. THIS MAY TAKE TIME UNTIL WE CLOSE ALL ISSUES. PLEASE OPEN ISSUES FOR DISCUSSION FIRST INSTEAD PULL REQUESTS. OTHER NOTES: